sinus - It is a cavity within a bone or other tissu, especially one in the bones of the face or skull connecting with the nasal cavities., nose - It is the part projecting above the mouth on the face of a person or animal, containing the nostrils and used for breathing and smelling., mouth - It is the opening in the lower part of the human face, surrounded by the lips, through which food is taken in and from which speech and other sounds are emitted., epiglottis - It is the flap that covers the trachea during swallowing so that food does not enter the lungs., trachea - It is a large membranous tube reinforced by rings and cartilage, extending from the larynx to the bronchial tubes and conveying air to and from the lungs., lungs - It is a pair of organs situated within the rig cage, consisting of elastic sacs with branching passages into which air is drawn, so that oxygen can pass into the blood and carbon dioxide can be removed. ,

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